TWI781594B - Touch display module and under-screen fingerprint recognition module thereof - Google Patents

Abstract

The present invention disclosed a touch display module and an under-screen fingerprint recognition module thereof. The under-screen fingerprint recognition module includes a transparent cover, a display layer, a multilayer support layer, and an ultrasound fingerprint sensor. The display layer is formed on the transparent cover. The top of the multilayer support layer has a shading glue layer. The bottom of the multilayer support layer has an installing recess. The shading glue layer is formed on the display layer. The ultrasound fingerprint sensor is formed in the installing recess and formed on the shading glue layer. The touch display module and the under-screen fingerprint recognition module shades the accommodation space of the installing recess of the support film with the shading glue layer, thereby improving the non-uniform brightness of a ring-shaped gap between the support film and the ultrasound fingerprint sensor.

Description

Touch display module and its under-screen fingerprint recognition module

The present invention relates to a fingerprint identification technology, and in particular to a touch display module and an under-screen fingerprint identification module.

The fingerprint identification device is set in the smart phone because of its privacy protection function. The fingerprint identification element can identify the fingerprint of the finger placed on the fingerprint identification element. When the user places his finger on the surface of the fingerprint identification element, the user The fingerprint of the finger will be recognized, and then verify the user's identity information to enhance the user experience.

As the screen design of mobile phones is getting bigger and bigger, and the frame size between the mobile phone design and the screen is getting smaller and smaller, it has become a mainstream trend in mobile phone design to place the fingerprint identification module used for biometric identification under the screen. . Fingerprint identification devices can be divided into optical, capacitive, and acoustic wave types. Acoustic fingerprint identification devices are widely used because their operation is not easily affected by ambient temperature and humidity, and they have a long life and high resolution. Generally speaking, the under-screen fingerprint recognition device includes a transparent cover, an organic light emitting diode module is arranged on the transparent cover, a supporting film is arranged on the organic light emitting diode module, and the supporting film has an opening through itself. , the opening is used to accommodate an ultrasonic fingerprint sensor. The external size of the ultrasonic fingerprint sensor will be smaller than the size of the opening to avoid the interference of the supporting film. The ultrasonic fingerprint sensor is bonded and fixed with the organic light-emitting diode module by using special glue, so that the ultrasonic fingerprint sensor and the organic light-emitting diode module are closely bonded. The supporting film is attached and fixed on the organic hair through another adhesive tape. on the photodiode module. Since there is a certain gap between the ultrasonic fingerprint sensor and the support film, when the organic light emitting diode module emits light, there will be light leakage due to the above gap, resulting in uneven brightness of the frame on the display screen.

Therefore, the present invention aims at addressing the above problems, and proposes a touch display module and an under-screen fingerprint recognition module to solve the problems caused by the prior art.

The invention provides a touch display module and an under-screen fingerprint identification module, which solves the problem of uneven brightness in the annular gap between the ultrasonic fingerprint sensor and the multilayer support film.

In one embodiment of the present invention, an under-screen fingerprint recognition module includes a transparent cover, a display layer, a multi-layer support film and an ultrasonic fingerprint sensor. The display layer is arranged under the transparent cover plate, the top of the multi-layer support film has a light-shielding adhesive layer, the bottom of the multi-layer support film has an installation groove, and the light-shielding adhesive layer is arranged under the display layer. The ultrasonic fingerprint sensor is located in the installation groove and under the light-shielding adhesive layer.

In an embodiment of the present invention, the under-screen fingerprint recognition module further includes a flexible circuit board, the flexible circuit board is arranged under the ultrasonic fingerprint sensor and the multi-layer support film, and is electrically connected to the ultrasonic fingerprint sensor.

In an embodiment of the present invention, the multi-layer support film further includes an anti-impact layer, a heat dissipation layer and an anti-electromagnetic interference layer. The anti-impact layer is arranged under the light-shielding adhesive layer, wherein the anti-impact layer has a first opening through itself, and the light-shielding adhesive layer covers all of the first opening. The heat dissipation layer is arranged under the impact-resistant layer, wherein the heat dissipation layer has a second opening through itself, and the light-shielding adhesive layer covers all of the second opening. The anti-electromagnetic interference layer is arranged under the heat dissipation layer, wherein the anti-electromagnetic interference layer has a third opening through itself, and the light-shielding adhesive layer covers all of the third opening, the first opening, the second opening and the third opening The openings communicate with each other to form a mounting groove with the light-shielding adhesive layer.

In an embodiment of the present invention, the distances between the ultrasonic fingerprint sensor and the supporting film around it are substantially the same.

In one embodiment of the present invention, the display layer is an organic light emitting diode module.

In an embodiment of the present invention, a touch display module includes a transparent cover plate, a touch electrode module, a display layer, a multi-layer support film and an ultrasonic fingerprint sensor. The touch electrode module is set under the transparent cover, the display layer is set under the touch electrode module, the top of the multi-layer support film has a light-shielding adhesive layer, the bottom of the multi-layer support film has a mounting groove, and the light-shielding adhesive layer Set under the display layer. The ultrasonic fingerprint sensor is located in the installation groove and under the light-shielding adhesive layer.

In one embodiment of the present invention, the touch display module further includes a flexible circuit board, the flexible circuit board is disposed under the ultrasonic fingerprint sensor and the multi-layer support film, and is electrically connected to the ultrasonic fingerprint sensor.

In an embodiment of the present invention, the multi-layer supporting film of the touch display module further includes an anti-impact layer, a heat dissipation layer and an anti-electromagnetic interference layer. The anti-impact layer is arranged under the light-shielding adhesive layer, wherein the anti-impact layer has a first opening through itself, and the light-shielding adhesive layer covers all of the first opening. The heat dissipation layer is arranged under the impact-resistant layer, wherein the heat dissipation layer has a second opening through itself, and the light-shielding adhesive layer covers all of the second opening. The anti-electromagnetic interference layer is arranged under the heat dissipation layer, wherein the anti-electromagnetic interference layer has a third opening through itself, and the light-shielding adhesive layer covers all of the third opening, the first opening, the second opening and the third opening The openings communicate with each other to form a mounting groove with the light-shielding adhesive layer.

In an embodiment of the present invention, the distances between the ultrasonic fingerprint sensors of the touch display module and the surrounding multi-layer supporting films are substantially the same.

In one embodiment of the present invention, the display layer of the touch display module is an organic light emitting diode module.

Based on the above, the touch display module and its fingerprint recognition module under the screen use the shading The adhesive layer shields the accommodation space of the installation groove of the multi-layer support film, so as to improve the problem of uneven brightness in the annular gap between the ultrasonic fingerprint sensor and the multi-layer support film.

In order to make your review committee members have a further understanding and understanding of the structural features and the achieved effects of the present invention, I would like to provide a better embodiment diagram and a detailed description, as follows:

1: Fingerprint recognition module under the screen

10: Transparent cover

11: Display layer

13: Multi-layer support film

130: Installation groove

130': Blackout adhesive layer

131: Impact layer

1310: The first opening

132: heat dissipation layer

1320: Second opening

133: Anti-electromagnetic interference layer

1330: The third opening

14: Ultrasonic fingerprint sensor

15: Flexible circuit board

2: Touch display module

20: Transparent cover

21: Display layer

23: Multi-layer support film

230: installation groove

230': Shading adhesive layer

231: Impact layer

2310: the first opening

232: heat dissipation layer

2320: Second opening

233: Anti-electromagnetic interference layer

2330: The third opening

24: Ultrasonic fingerprint sensor

25: Touch electrode module

26: Flexible printed circuit board

A, A': cutting face line

B, B': cutting face line

Figure 1 is a bottom view of the structure of an under-screen fingerprint recognition module according to an embodiment of the present invention.

Fig. 2 is a structural sectional view along line A-A' of Fig. 1.

Figure 3 is a photo of the under-screen fingerprint recognition module of the present invention.

Fig. 4 is a luminance distribution diagram of the under-screen fingerprint recognition module of the present invention.

FIG. 5 is a bottom view of the structure of a touch display module according to an embodiment of the present invention.

Fig. 6 is a structural sectional view along line B-B' of Fig. 5.

Embodiments of the present invention will be further explained in conjunction with related figures below. Wherever possible, the same reference numerals have been used throughout the drawings and description to refer to the same or similar components. In the drawings, the shape and thickness may be exaggerated for the sake of simplification and convenient labeling. It should be understood that elements not particularly shown in the drawings or described in the specification are forms known to those skilled in the art. Those skilled in the art can make various changes and modifications according to the content of the present invention.

When an element is referred to as being "on", it may generally mean that the element is directly on other elements, or there may be other elements present in between. Conversely, when an element is referred to as being "directly on" another element, it cannot have the other element in between. As used herein, the word "and/or" includes any combination of one or more of the associated listed items.

The following description about "one embodiment" or "an embodiment" refers to at least A particular element, structure or feature associated within an embodiment. Therefore, multiple descriptions of "one embodiment" or "an embodiment" appearing in various places below do not refer to the same embodiment. Furthermore, specific components, structures and features in one or more embodiments may be combined in an appropriate manner.

The disclosure is particularly described with the following examples, which are for illustration only, since various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the disclosure, and therefore this The scope of protection of the disclosed content shall be subject to the definition of the appended patent application scope. Throughout the specification and claims, the meanings of "a" and "the" include that such description includes "one or at least one" of the element or component, unless the content clearly specifies otherwise. Furthermore, as used in the present disclosure, singular articles also include descriptions of plural elements or components, unless it is obvious from the specific context that the plural is excluded. Also, as applied in this description and all claims below, the meaning of "in" may include "in" and "on" unless the content clearly dictates otherwise. The terms (terms) used throughout the specification and patent claims generally have the ordinary meaning of each term used in this field, in the content of this disclosure and in the specific content, unless otherwise specified. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide practitioners with additional guidance in describing the disclosure. The use of examples anywhere throughout the specification, including examples of any terms discussed herein, is for illustration only and certainly does not limit the scope and meaning of the disclosure or any exemplified term. Likewise, the present disclosure is not limited to the various embodiments presented in this specification.

It will be understood that the terms "comprising", "including", "having", "containing", "involving", etc. as used herein are open-ended The (open-ended) means including but not limited to. In addition, any embodiment or scope of claims of the present invention does not necessarily achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract and title are only used to assist in the search of patent documents, and are not used to limit the scope of patent applications for inventions.

The terms "substantially", "around", "about" or "approximately" as used herein shall generally mean within 20% of a given value or range, Preferably within 10%. Furthermore, quantities provided herein may be approximate, thus meaning that the words "about", "about" or "approximately" may be used unless otherwise stated. When a quantity, concentration, or other value or parameter has a specified range, preferred range, or tabulated upper and lower ideal values, it shall be deemed to specifically disclose all ranges formed by any pair of upper and lower limits or ideal values, regardless of Whether the areas are disclosed separately. For example, if a certain length of the disclosed range is X centimeters to Y centimeters, it should be deemed that the disclosed length is H centimeters and H can be any real number between X and Y.

In addition, if the term "electrical (sexual) coupling" or "electrical (sexual) connection" is used herein, it includes any direct and indirect electrical connection means. For example, if it is described that a first device is electrically coupled to a second device, it means that the first device can be directly connected to the second device, or indirectly connected to the second device through other devices or connection means. device. In addition, if you describe the transmission and provision of electrical signals, those familiar with the art should be able to understand that the transmission of electrical signals may be accompanied by attenuation or other non-ideal changes, but if the source and receiver of electrical signal transmission or provision are not special In essence, it should be regarded as the same signal. For example, if an electrical signal S is transmitted (or provided) from terminal A of the electronic circuit to terminal B of the electronic circuit, it may pass through the source and drain terminals of a transistor switch and/or possible stray capacitance. A voltage drop is generated, but if the purpose of this design is not to deliberately use the attenuation or other non-ideal changes generated during transmission (or provision) to achieve certain specific technical effects, the electrical signal S is between the terminal A and the terminal of the electronic circuit. B should be considered as substantially the same signal.

Unless otherwise specified, some conditional sentences or words, such as "can (can)", "maybe (could)", "maybe (might)", or "may" are usually intended to express that the embodiments of the present case have, However, it may also be interpreted as a feature, element, or step that may not be required. In other embodiments, these features, elements, or steps may not be required.

An under-screen fingerprint recognition module and its under-screen fingerprint recognition module of the present invention will be proposed below. The fingerprint identification module uses a light-shielding adhesive layer to cover the installation groove of the multi-layer support film to improve the problem of uneven brightness in the annular gap between the ultrasonic fingerprint sensor and the multi-layer support film.

Figure 1 is a bottom view of the structure of an under-screen fingerprint recognition module according to an embodiment of the present invention, and Figure 2 is a cross-sectional view of the structure along line A-A' in Figure 1. Please refer to FIG. 1 and FIG. 2, the under-screen fingerprint recognition module 1 of an embodiment of the present invention is introduced below. The under-screen fingerprint identification module 1 includes a transparent cover 10 , a display layer 11 , a multi-layer support film 13 and an ultrasonic fingerprint sensor 14 . The transparent cover 10 is preferably a glass cover, but the invention is not limited thereto. The bottom of the multilayer support film 13 has a mounting groove 130, and the top of the multilayer support film 13 has a light-shielding adhesive layer 130', and the material of the light-shielding adhesive layer 130' is opaque adhesive material or opaque tape. In order to enhance the strength of the ultrasonic signal emitted by the ultrasonic fingerprint sensor 14, the material of the light-shielding adhesive layer 130' must have the acoustic resistance matching the ultrasonic signal. The display layer 11 is, for example, an organic light emitting diode module, but is not limited to an organic light emitting diode module, and can also be other electronic modules capable of emitting light, such as a micro light emitting diode module. The under-screen fingerprint recognition module 1 can further include a polarizer, which is disposed between the display layer 11 and the transparent cover 10, and the polarizer can filter or otherwise process the light emitted by the display layer 11 to improve the image display quality. The display layer 11 is arranged under the transparent cover plate 10, and the light-shielding adhesive layer 130' is arranged under the display layer 11. There is no structure between the light-shielding adhesive layer 130' and the display layer 11, and covers the entire display layer 11. The ultrasonic fingerprint sensor 14 is located in the installation groove 130, and is arranged under the light-shielding adhesive layer 130'. Generally, the size of the installation groove 130 cannot be the same as that of the ultrasonic fingerprint sensor 14 because of design tolerances. In design, the distance between the ultrasonic fingerprint sensor 14 and the surrounding multilayer supporting film 13 can be substantially the same, for example, the distance between the ultrasonic fingerprint sensor 14 and the surrounding multilayer supporting film 13 can be substantially the same. Both are 10% of the width or length of the multilayer support film 13 . Because the under-screen fingerprint recognition module 1 uses an ultrasonic fingerprint sensor 14 instead of an optical fingerprint sensor, the entire volume of the installation opening 130 of the multilayer support film 13 can be covered by the light-shielding adhesive layer 130 ′. The gap between the ultrasonic fingerprint sensor 14 and the multi-layer support film 13 can be improved to solve the problem of uneven brightness. The light-shielding adhesive layer 130' can also be double-sided adhesive tape, which can be used to fix the display The layer 11 and the multi-layer support film 13 are used to achieve the purpose of shading and reducing the thickness of the fingerprint recognition module 1 under the screen.

In some embodiments of the present invention, the under-screen fingerprint identification module 1 may further include a flexible circuit board 15, the flexible circuit board 15 is arranged under the ultrasonic fingerprint sensor 14 and the multi-layer support film 13, and is electrically connected Ultrasonic fingerprint sensor 14. When performing fingerprint identification, the user's finger will touch the transparent cover 10 , because the ultrasonic fingerprint sensor 14 has a piezoelectric material layer, and the piezoelectric material layer has the function of sending and receiving ultrasonic waves at the same time. At this time, the flexible circuit board 15 provides electric energy to the ultrasonic fingerprint sensor 14, causing the piezoelectric material layer to vibrate and deform, thereby generating ultrasonic signals. After the ultrasonic signal is transmitted to the finger through the light-shielding adhesive layer 130 ′, the display layer 11 and the transparent cover 10 in sequence, the finger sends the ultrasonic signal through the transparent cover 10 , the display layer 11 and the light-shielding adhesive layer 130 ′ in sequence. Reflected to the piezoelectric material layer, the piezoelectric material layer receives the reflected ultrasonic signal and converts the ultrasonic signal into an electrical signal, and transmits the electrical signal to the flexible circuit board 15 for subsequent fingerprint identification procedures.

In some embodiments of the present invention, the multilayer support film 13 may further include an anti-impact layer 131 , a heat dissipation layer 132 and an anti-electromagnetic interference layer 133 . For example, the anti-shock layer 131 can be made of foam, the heat dissipation layer 132 can be a graphite sheet, and the anti-electromagnetic interference layer 133 can be a copper foil layer. The impact-resistant layer 131 is disposed under the light-shielding adhesive layer 130', wherein the impact-resistant layer 131 has a first opening 1310 passing through itself, and the light-shielding adhesive layer 130' covers all of the first opening 1310. The heat dissipation layer 132 is disposed under the impact-resistant layer 131, wherein the heat dissipation layer 132 has a second opening 1320 passing through itself, and the light-shielding adhesive layer 130' covers the entire second opening 1320. The anti-electromagnetic interference layer 133 is disposed under the heat dissipation layer 132, wherein the anti-electromagnetic interference layer 133 has a third opening 1330 through itself, and the light-shielding adhesive layer 130' covers all of the third opening 1330, and the first opening 1310 , The second opening 1320 and the third opening 1330 communicate with each other to form a mounting groove 130 with the light-shielding adhesive layer 130 ′.

Figure 3 is a photo of the under-screen fingerprint recognition module of the present invention. Figure 4 is the basis Brightness distribution diagram of the under-screen fingerprint recognition module of the invention. Please refer to Fig. 2, Fig. 3 and Fig. 4. In Fig. 3 and Fig. 4, the area enclosed by the box is the area where the ultrasonic fingerprint sensor 14 is located. The brightness of the annular gap between the detector 14 and the multi-layer support film 13 and its surrounding area is uniform.

Fig. 5 is a bottom view of the structure of a touch display module according to an embodiment of the present invention, and Fig. 6 is a cross-sectional view of the structure along line B-B' in Fig. 5 . Please refer to FIG. 5 and FIG. 6, the touch display module 2 according to an embodiment of the present invention is introduced below. The touch display module 2 includes a transparent cover 20 , a display layer 21 , a multi-layer support film 23 , an ultrasonic fingerprint sensor 24 and a touch electrode module 25 . The transparent cover 20 is preferably a glass cover, but the invention is not limited thereto. The top of the multilayer support film 23 has a mounting groove 230, and the top of the multilayer support film 23 has a light-shielding adhesive layer 230', and the material of the light-shielding adhesive layer 230' is opaque adhesive material or opaque tape. In order to enhance the strength of the ultrasonic signal emitted by the ultrasonic fingerprint sensor 24, the material of the light-shielding adhesive layer 230' must have the acoustic resistance matching the ultrasonic signal. The display layer 21 is, for example, an organic light emitting diode module, but is not limited to an organic light emitting diode module, and can also be other electronic modules capable of emitting light, such as a micro light emitting diode module. The touch display module 2 can further include a polarizer, which is disposed between the display layer 21 and the transparent cover 20 , and the polarizer can filter or otherwise process the light emitted by the display layer 21 to improve image display quality. The touch electrode module 25 is arranged under the transparent cover 20 , the display layer 21 is arranged under the touch electrode module 25 , the light-shielding adhesive layer 230 ′ is arranged under the display layer 21 , the light-shielding adhesive layer 230 ′ and the display layer 21 There is no structure between them, and covers the entire display layer 21 . In one embodiment, the touch electrode module 25 is an in-cell touch electrode module. In other embodiments, the touch electrode module 25 can be an on-cell touch electrode module. touch) electrode module, or the touch electrode module 25 can also be integrated in the transparent cover 20 . In one embodiment, the touch electrode module 25 is a self-capacitive sensing structure, and in other embodiments, the touch electrode module 25 may be a mutual capacitive sensing structure or a resistive sensing structure.

The ultrasonic fingerprint sensor 24 is located in the installation groove 230 and is arranged on the light-shielding adhesive layer 230' on. Generally, the size of the mounting groove 230 cannot be the same as that of the ultrasonic fingerprint sensor 24 because of design tolerances. In design, the distance between the ultrasonic fingerprint sensor 24 and the surrounding multilayer supporting film 23 can be substantially the same. For example, the distance between the ultrasonic fingerprint sensor 24 and the surrounding multilayer supporting film 23 can be substantially the same. Both are 10% of the width or length of the multilayer support film 23 . Because the touch display module 2 uses an ultrasonic fingerprint sensor 24 instead of an optical fingerprint sensor, the entire installation opening 230 of the multilayer support film 23 can be covered by the light-shielding adhesive layer 230 ′, so that The problem of uneven brightness in the annular gap between the ultrasonic fingerprint sensor 24 and the multi-layer support film 23 is improved. In addition, the photo graph and luminance distribution graph of the touch display module 2 are the same as the photo graph and luminance distribution graph of the under-screen fingerprint recognition module respectively, and will not be repeated here.

In some embodiments of the present invention, the touch display module 2 may further include a flexible circuit board 26, the flexible circuit board 26 is arranged under the ultrasonic fingerprint sensor 24 and the multi-layer support film 23, and is electrically connected to the ultra- Sonic fingerprint sensor 24. When performing fingerprint recognition, the user's finger will touch the transparent cover 20 . Since the ultrasonic fingerprint sensor 24 has a piezoelectric material layer, the piezoelectric material layer has the functions of sending and receiving ultrasonic waves. At this time, the flexible circuit board 26 provides electric energy to the ultrasonic fingerprint sensor 24, causing the piezoelectric material layer to vibrate and deform, thereby generating ultrasonic signals. After the ultrasonic signal is transmitted to the finger through the light-shielding adhesive layer 230 ′, the display layer 21 , the touch electrode module 25 and the transparent cover 20 in sequence, the finger sends the ultrasonic signal through the transparent cover 20 , the touch electrode in sequence. The module 25, the display layer 21 and the light-shielding adhesive layer 230' are reflected on the piezoelectric material layer, and the piezoelectric material layer receives the reflected ultrasonic signal and converts the ultrasonic signal into an electrical signal, and transmits the electrical signal to the flexible circuit board 26, to carry out the procedure of subsequent fingerprint identification.

In some embodiments of the present invention, the multi-layer support film 23 may further include an anti-impact layer 231 , a heat dissipation layer 232 and an anti-electromagnetic interference layer 233 . For example, the anti-shock layer 231 can be made of foam, the heat dissipation layer 232 can be a graphite sheet, and the anti-electromagnetic interference layer 233 can be a copper foil layer. The impact-resistant layer 231 is located under the light-shielding adhesive layer 230', wherein the impact-resistant layer 231 has a penetrating One of the first openings 2310 of the body, and the light-shielding adhesive layer 230' covers the whole of the first opening 2310. The heat dissipation layer 232 is disposed under the impact-resistant layer 231, wherein the heat dissipation layer 232 has a second opening 2320 passing through itself, and the light-shielding adhesive layer 230' covers the entire second opening 2320. The anti-electromagnetic interference layer 233 is disposed under the heat dissipation layer 232, wherein the anti-electromagnetic interference layer 233 has a third opening 2330 through itself, and the light-shielding adhesive layer 230' covers all of the third opening 2330, and the first opening 2310 , The second opening 2320 and the third opening 2330 communicate with each other to form a mounting groove 230 with the light-shielding adhesive layer 230 ′.

According to the above-mentioned embodiments, the touch display module and its under-screen fingerprint identification module use a light-shielding adhesive layer to cover the accommodating space of the installation groove of the multi-layer support film, so as to improve the gap between the ultrasonic fingerprint sensor and the multi-layer support film. The problem of uneven brightness occurs in the annular gap.

The above is only a preferred embodiment of the present invention, and is not used to limit the scope of the present invention. Therefore, all equal changes and modifications are made according to the shape, structure, characteristics and spirit described in the patent scope of the present invention. , should be included in the patent application scope of the present invention.

1: Fingerprint recognition module under the screen

10: Transparent cover

11: Display layer

13: Support membrane

130: Installation groove

130': Blackout adhesive layer

131: Impact layer

1310: The first opening

132: heat dissipation layer

1320: Second opening

133: Anti-electromagnetic interference layer

1330: The third opening

14: Ultrasonic fingerprint sensor

15: Flexible circuit board

Claims (10)

An under-screen fingerprint identification module, comprising: a transparent cover plate; a display layer arranged under the transparent cover plate; a multi-layer support film with a light-shielding glue layer on the top and a light-shielding adhesive layer on the bottom of the multi-layer support film An installation groove, the light-shielding adhesive layer is arranged under the display layer; and an ultrasonic fingerprint sensor is located in the installation groove and arranged under the light-shielding adhesive layer, wherein the ultrasonic fingerprint sensor is used To send out ultrasonic signals; wherein there is no structure between the display layer and the light-shielding adhesive layer, and the material of the light-shielding adhesive layer has an acoustic resistance matching the ultrasonic signal; wherein the light-shielding adhesive layer is double-sided adhesive . The under-screen fingerprint recognition module as described in claim 1 further includes a flexible circuit board, which is arranged under the ultrasonic fingerprint sensor and the multi-layer support film, and is electrically connected to the ultrasonic fingerprint sensor. detector. The under-screen fingerprint recognition module as described in Claim 1, wherein the multi-layer support film further includes: an impact-resistant layer disposed under the light-shielding adhesive layer, wherein the impact-resistant layer has a first opening through itself , and the light-shielding adhesive layer covers all of the first opening; a heat dissipation layer is arranged under the impact-resistant layer, wherein the heat dissipation layer has a second opening through itself, and the light-shielding adhesive layer covers the All of the second openings; and an anti-electromagnetic interference layer disposed under the heat dissipation layer, wherein the anti-electromagnetic interference layer has a third opening through itself, and the light-shielding adhesive layer covers the third opening All of the holes, the first opening, the second opening and the third opening communicate with each other to form the installation groove with the light-shielding adhesive layer. The under-screen fingerprint recognition module according to claim 1, wherein the distance between the ultrasonic fingerprint sensor and the surrounding multi-layer supporting film is substantially the same. The under-screen fingerprint recognition module according to claim 1, wherein the display layer is an organic light emitting diode module. A touch display module, comprising: a transparent cover plate; a touch electrode module set under the transparent cover plate; a display layer set under the touch electrode module; a multi-layer support film, which The top has a light-shielding adhesive layer, the bottom of the multi-layer support film has an installation groove, the light-shielding adhesive layer is arranged under the display layer; and an ultrasonic fingerprint sensor is located in the installation groove, and is set Under the light-shielding adhesive layer, the ultrasonic fingerprint sensor is used to send out ultrasonic signals; there is no structure between the display layer and the light-shielding adhesive layer, and the material of the light-shielding adhesive layer has the ability to match the ultra-sonic Acoustic resistance of sound wave signal; wherein the light-shielding adhesive layer is double-sided adhesive. The touch display module as described in claim 6 further includes a flexible circuit board, the flexible circuit board is arranged under the ultrasonic fingerprint sensor and the multi-layer support film, and is electrically connected to the ultrasonic fingerprint sensor device. The touch display module as described in Claim 6, wherein the multi-layer support film further comprises: an impact-resistant layer disposed under the light-shielding adhesive layer, wherein the impact-resistant layer has a first opening through itself, And the light-shielding adhesive layer covers the first opening the whole; a heat dissipation layer disposed under the impact-resistant layer, wherein the heat dissipation layer has a second opening through itself, and the light-shielding adhesive layer covers the entire second opening; and an anti-electromagnetic interference layer, Located under the heat dissipation layer, wherein the anti-electromagnetic interference layer has a third opening through itself, and the light-shielding adhesive layer covers all of the third opening, the first opening, the second opening and The third openings communicate with each other to form the installation groove with the light-shielding adhesive layer. The touch display module as claimed in claim 6, wherein the distance between the ultrasonic fingerprint sensor and the surrounding multi-layer supporting film is substantially the same. The touch display module according to claim 6, wherein the display layer is an organic light emitting diode module.

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